Time would be better spent improving gamma and dynamic range.
Extra resolution is a highly desirable goal but a better priority would be to spend time improving both the gamma and dynamic range of both image sensors and displays.
1. Image sensors need to have a much better dynamic range than the current practical limit of about 10 stops before white clipping occurs. This would allow the camera electronics to properly simulate the Hurter–Driffield slanted-S (log exposure) curve of film (thus allowing detail to be extracted from the 'toe' [low light] and the 'shoulder' [highlights] of the image--still a major problem for electronic image sensors (television systems). At least 13 or 14 stops dynamic range should be the short-term target for digital image sensors so we can enter the High Dynamic Range Imaging (HDRI) era.
2. Large hi-res extended dynamic range displays such as OLED etc. are urgently needed to display the extra dynamic range (leaving geometry and res aside, the best CRTs still look better than LCD displays when it comes to dynamic range and so does the best film projected by a black-body radiator (tungsten filament) light source.
3. The colour gamut also needs to be widened--look how pathetically limited the current sRGB triangle is on the CIE 1931 color space chromaticity diagram [see Wiki--color gamut]. (Perhaps we even need research into four-coordinate (2 greens) colour systems.)
Preoccupation with image resolution at the expense of gamut and dynamic range seems counterproductive and shortsighted. Moreover, in this digital age, we should not lose sight of how remarkably good a film negative can be when it comes to dynamic range--after all, it's had 150 years development (although the same cannot be said about film's limited colour gamut).
Remember your eye can accommodate (adjust to) a dynamic range of over 10^6 whilst the best LCDs barely make 10^3 (despite the advertising blurb)!